| Standard label: | Liability for Future Policy Benefit, Expected Net Premium, Period Increase (Decrease) |
| Name: | us-gaap:LiabilityForFuturePolicyBenefitExpectedNetPremiumPeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) in expected net premium component for liability for future policy benefit. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LiabilityForFuturePolicyBenefitExpectedNetPremiumPeriodIncreaseDecrease |
| Label | Role | Language |
| Liability for Future Policy Benefit, Expected Net Premium, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Liability for Future Policy Benefit, Expected Net Premium, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 65 2 (g)(1) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 40 50 6 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |